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The Inspector General for Emergency Management will investigate the cause of those deaths and his findings will form part of an overarching review that will examine how Ambulance Victoria and emergency services responded and how the community was notified of the unfolding crisis.

Hospitals across Melbourne are continuing to treat another 20 people for a variety of respiratory and related conditions.

Across Monday and Tuesday, they treated more than 8500 patients.

At one point on Monday evening, there were 140 simultaneous "code one" cases.

The perfect storm event saw a high pollen count and thunderstorm conditions combine to produce tiny particles in the air that penetrated deep into people's airways, causing attacks for asthma sufferers.

A team of experts is now trying to determine whether severe asthma storms can be predicted in the future.

They occur when grass pollen, dust and other allergens are blown ahead of a storm front and then rupture into tiny particles that can penetrate deep into people's airways.